import React, { Component } from "react";
import {withRouter} from 'react-router-dom'


class Header extends Component {
  back = ()=>{
    this.props.history.goBack()
  }

  forward = ()=>{
    this.props.history.goForward()
  }
  go = ()=>{
    this.props.history.go(-2)
  }
  
  render() {
    console.log("Header组件收到的数据为：", this.props);
    return (
      <div className="page-header">
        <h2>React Router Demo</h2>
        <button onClick={this.back}>回退</button>&nbsp;
				<button onClick={this.forward}>前进</button>&nbsp;
				<button onClick={this.go}>go</button>&nbsp;
      </div>
    );
  }
}

export default withRouter(Header)

//withRouter 可以加工一般组件，让一般组件具有路由组件所特有的API
//withRouter 的返回值是一个新组件
